﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Circle : Shape
    {
        private int a;

        public int A { get => a; set => a = value; }

        public override Shape GetArea()
        {
            int area = 0;
            area = A * A;
            Console.WriteLine("面积为：" + area);
        }
    }
}
